Still bummed out that Gens 1-7 never produced any
Grass/Fire
Grass/Water
Grass/Electric
or Grass/Rock
pokemon. Except that there is a Water/Grass and Rock/Grass family and a mow Rotom. But what's so special about the above list... is that none of those type combos, have a 4x weakness. I think the other onlys that don't have a 4x weakness, are Grass/Poison and Grass/Ghost, and we have somewhat plenty of those.
I don't think they will all be filled this Gen but hopefully some.
And what's so great about the Grass types - they're 1 of only 2 elements, to resist Ground. The other being Bug. Generally Fire, Poison, Electric, Steel, are all nice to be paired with Grass to avoid that Earthquake weakness.
Some could be for future starters? Grass/electric and grass/rock. Some will be regional forms of old pokemon. Ludicolo, Maractus, Cacturne, and Sunflora could all be fire/grass in hot desert or vulvanic or Galar taking Sunflora. Those those learn water moves? Fire/grass would make them type wise better , they should be mostly slower... Still weak to poison and flying moves that their ofiginal forms learn.